Ensure all metadata definition code uses six.itertypes

[Travis Tripp]

Similar to https://review.openstack.org/#/c/95467/

According to https://wiki.openstack.org/wiki/Python3 dict.iteritems()
should be replaced with six.iteritems(dict).

All metadata definition code added should ensure that six.iteritems is used.

[Travis Tripp (travis-tripp)]

As you are working on code now with this in it, if you fix this anywhere, be sure to mention them in the commit message using the following syntax:

Partial-Bug: *******
 or
Related-Bug *******

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/122429

[Pawel Skowron (pawel-skowron)]

I did not find any issues with dict.iteritems in python-glanceclient part of the bug.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/122429
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=1cdc555d21c532d7e4963ed1784a488769abdd1b
Submitter: Jenkins
Branch: master

commit 1cdc555d21c532d7e4963ed1784a488769abdd1b
Author: Pawel Skowron <email address hidden>
Date: Thu Sep 18 16:12:52 2014 +0200

    replace dict.iteritems() with six.iteritems(dict)

    All metadata definition code added should ensure that
    six.iteritems is used.

    Change-Id: Ic93595ffb2a5a8ed7667028d820fac8debd988e6
    Closes-Bug: #1370769